Grinding apparatus



Dec. 24, 1968 H. E. ROSE 3,417,517

GRINDING APPARATUS Filed Dec. 14, 1965 5 Sheets+Sheet 1 Fl G. 1

HOWARD E. ROSE m/vavrm 5r Sac/(HORN, BL ORE, KL mou/sr a SPAR/(MAN ATTORNEYS Dec. 24, 1968 H. E. ROSE 3,417,517

GRINDING APPARATUS Filed Dec. 14, 1965 5 Sheets-Sheet 2 FIG.2

I54 I3 136 I 23 HOWARD E. ROSE lNl/E/VTOR BUG/(HORN, BLORE, KLAROU/ST 8 SPAR/(MAN ATTORNEYS Dec. 24, 1968 H. E. ROSE 3, I

GRINDING APPARATUS Filed Dec. 14, 1965 3 Sheets-Sheet 5 FIG. 4

88 SI 86 i0 88 HOWARD E. ROSE INVENTOR B) BUCKHOR/V, BLORE, KLAROU/ST 8 SPAR/(MAN W ATTORNEYS United States Patent 3,417,517 GRINDING APPARATUS Howard E. Rose, 1628 N. Columbia Blvd., Portland, Oreg. 97217 Filed Dec. 14, 1965, Ser. No. 513,773 2 Claims. (Cl. 51356) ABSTRACT OF THE DISCLOSURE Annular grinding wheels are mounted on flanged hubs which are individually driven by a double ended motor through stepped pulleys. Each hub is cup-shaped and has a stepped rim portion to which water passages extend to distribute water.

Description This invention relates to an improved grinding apparatus, and more particularly to an improved stone grinding apparatus for rock hounds.

An object of the invention is to provide a new and improved grinding apparatus.

Another object of the invention is to provide a new and improved stone grinding apparatus for rock hounds.

A further object of the invention is to provide a simple, inexpensive hub for mounting an annular grinding wheel and for supplying water uniformly to all portions of the periphery of the grinding wheel.

Another object of the invention is to provide a hub structure for mounting a grinding wheel and for supplying water thereto which requires a minimum of boring and machining operations.

Another object of the invention is to provide a compact, dual arbor grinding apparatus having individual arbor speed control.

The invention provides an improved grinding apparatus preferably including a hub mounting an annular grind ing wheel and having radially inwardly facing channel portions of difierent lengths for guiding water to spaced portions of the inner periphery of the grinding wheel. The grinding apparatus preferably includes two arbors mounted on a frame and each arbor mounting a grinding wheel and having a stepped pulley with an electric motor having stepped pulleys at opposite ends thereof for driving the arbors individually with a watering device mounted on the frame and supplying water to water distributing hubs on the arbors. There preferably is provided a dresser rest mounted reversibly on the frame for supporting a dressing tool for dressing grinding wheels mounted on the hubs.

A complete understanding of the invention may be obtained from the following detailed description of an improved grinding apparatus forming a specific embodiment of the invention, when read in conjunction with the appended drawings, in which:

FIG. 1 is a top plan view of an improved grinding apparatus forming a specific embodiment of the invention;

FIG. 2 is a vertical sectional view taken substantially along line 2-2 of FIG. 1;

FIG. 3 is a vertical sectional view taken substantially along line 33 of FIG. 1;

FIG. 4 is an enlarged, vertical sectional View taken substantially along line 4-4 of FIG. 1;

FIG. 5 is a vertical sectional View taken substantially along line 55 of FIG. 4; and

FIGS. 6 and 7 are inclined sectional views taken substantially along lines 66 and 77, respectively, of FIG. 4.

Referring now in detail to the drawings, an improved Patented Dec. 24, 1968 grinding apparatus shown therein includes a pair of grinding wheels 10 and 12 (FIGS. 1 and 2) mounted by identical hubs 14 and 16 on arbors 18 and 20 carried by a frame 22 fixed to a base 23, the arbors being driven individually by a double-ended electric motor 24. A watering device 26 mounted on a top 28 of the frame supplies water individually to the hubs 14- and 16 through bendable tubes 30 and 32 under the control of metering and shut-off valves 34 and 36. The arbors 18 and 20 are parallel and are journaled in large inboard bearings 38, and small outboard bearings 40 all bolted to channellike end Walls 42 and 44 of the frame. Matched, stepped pulleys 46 and 48 fixed to a motor shaft 50 and the arbor 18, respectively, and a belt 52 drive the arbor 18. Matched, stepped pulleys 54 and 56 fixed to the motor shaft and the arbor 20, respectively, and a belt 58 drive the arbor 20.

To continuously supply water to and uniformly distribute the water over outer periphery 70 of grinding Wheel 10, the water from the device 26 drips from the outlet end of the tube 30 onto a frustoconical surface 72 (FIG. 5) of the hub 14 as the hub is rotated by the arbor 18. The hub 14 has finger-like extensions to make it generally cup-shaped, and has a clamping flange portion 73 adapted to engage face 86 of the wheel 10. The water is moved by centrifugal action along the surface 7'2 radially outwardly and to the right, as viewed in FIG. 5, radially outwardly along a web portion 74 to an inwardly, facing undercut or frustoconical portion 76, and through passages 77, 78 and 79, which extend to portions of inner periphery 80 of the grinding wheel 10 spaced axially along the inner periphery. The water then flows by centrifugal action through the porous grinding wheel 10 out to the outer periphery 70 (FIG. 3) in uniformly distributed quantities.

There are four each of the passages 77, 78 and 79 (FIG. 4) positioned equiangularly around the hub to distribute the water uniformly around the outer periphery of the grinding wheel. The passages 77 (FIG. 7) extend to a face 82 of the web 74, and are formed by short bores. The exit ends of the passages 77 intersect a peripheral portion 84 of the hub which fits closely into the grinding wheel 10. The exit ends of the passages 77 are at points on the inner periphery 80 roughly one-third of the distance from the end face 86 to an end face 88 of the grinding wheel 10. The passages 78 (FIG. 6) extend about halfway through the central hole in the grinding wheel 10 and comprise bores 90 through the web portion '74 and radially inwardly facing channels 92 extending from and forming continuations of the bores 90. The channels 92 intersect the periphery 84 about halfway between the faces 86 and 88. The passages 79 comprise bores 96 through the web portion 74 and inwardly facing channels 98 extending from the bores 96 about twothirds of the way from the face 86 to the face 88 of the grinding wheel 10. The hub 14 is preferably composed of plastic or diecast aluminum and a blank thereof may be molded or cast complete except for the undercut surface 76 which is later turned and the passage 77 and the bores 90 and 96 which are later bored therein. In eifect, the righthand end portion of the hub is a series of steps as best illustrated in FIG. 5, the portions containing the channels 92 and 98 being stepped. The hub has a central, reduced hub portion 99 fitting on the shaft.

The hub 14 and a flange 100 (FIG. 5) press against the faces 86 and 88 of the grinding wheel 10 and grip the grinding wheel therebetween. A nut 102 and a washer 104 on the arbor hold the hub 14 on the arbor and press it tightly against the grinding wheel to press the grinding wheel against -a trued face 106 of the flange and press the flange 1130 tightly against an end face 108 of the pulley 48, which is rigidly fixed by a setscrew (not shown) to the arbor 18. The pulley 48 drives the flange 100 which drives the grinding wheel 10, which drives the hub 14, which drives the arbor 18. The hub 16 and a flange 109 (FIG. 1) similarly mount the grinding wheel 12 on the arbor 20, and the hub 16 similarly distributes the water from the tube 32 uniformly over the inner periphery of the porous grinding wheel 12, the Water being moved out by centrifugal action to outer periphery of the grinding wheel 12.

A flange (FIG. 3) of the motor 24 has holes (not shown) fitting loosely over pins 122 fixed to the frame 22 to mount the motor pivotally on the base in a position extending beyond the base. The belts 52 and 58 (FIG. 1) limit counterclockwise movement of the motor, as viewed in FIG. 3, and are tensioned by the overhanging motor. Each of the belts 52 and 58 (FIG. 1) may be adjusted individually on the pairs of inversely stepped pulleys 48 and 50 and 54 and 56, the belt 58 being somewhat shorter than the belt 52 to compensate for the closer position of the arbor 20 relative to the motor which is parallel to the arbors 18 and 20. By these individual adjustments, the peripheral speed of each grinding wheel 10 and 12 is kept optimum for safety and for grinding for that wheel regardless of any diflerence in outer diameters between the wheels.

Lighting devices and 132 (FIG. 2) are mounted on the frame 22, and generally cylindrical guards 134 and 136 are provided to restrain water flying off the wheels and guide the water into drain pans 138 and 140. Latches 142 and 144 normally hold the pans on the base 23. The guards 134 and 136 are of sheet metal and have narrow, recessed or retracted portions and 152 exposing the working portions of the grinding wheels and wide, covering portions 154 and 156 covering the top and rear portions of the wheels. Blocks 157 and 158 resting in the pans support the guards removably.

The watering device 26 (FIGS. 1, 2 and 3) includes a jar 160 containing water and open at the lower portion thereof only. The jar fits loosely in a cup 162 having a base 164 secured by screws 166 to the top 28 of the frame 22.

A dresser rest 170 (FIGS. 1, 2 and 3) has a mounting portion 172 provided with slots 174 and 176 for removably mounted the rest detachably on threaded studs 178 and 180 carried rigidly by the frame 22. The rest has a supporting portion 182 offset from the mounting portion a distance one-half the distance between the centerlines of the arbors 18 and 20 and may be reversed from a first position shown in full lines in FIG. 1 for dressing the grinding wheel 20 to a second position shown in phantom lines in FIG. 1 for dressing the grinding wheel 18. The position of the rest may be adjusted by moving pairs of nuts 184 and 186 along the studs. Normally the rest is removed so that both wheels may be used. The portion 182 is adapted to be engaged by a guide shoe 190 (FIG. 3) of a diamond pointed dressing tool 192.

It is to be understood that the above-described arrangements are simply illustrative of the application of the principles of the invention. Numerous other arrangements may be readily devised by those skilled in the art which will embody the principles of the invention and fall within the spirit and scope thereof.

What is claimed is:

1. In a hub for mounting a grinding wheel,

a flange portion for engaging one face of a grinding wheel, a hub portion having a peripheral portion extending from the flange portion into the grinding wheel,

the peripheral porion having longitudinal projections extending diiierent distances into the grinding wheel and having water passages extending to the ends of the longitudinal projections,

the end of the peripheral portion remote from the flange portion being stepped to provide end portions spaced longitudinally from each other along the peripheral portions and defining the exit ends of the passages.

2. In a hub for mounting a grinding wheel,

a clamping flange portion,

and a generally cup-shaped hub portion extending axially from the flange portion, the cup-shaped portion having a web having a central bore adapted to fit on an arbor and a hollow cylindrical portion adapted to fit into a grinding wheel,

the web and the cylindrical portion being provided with Water passages extending through the web and along the inner periphery of the hollow cylindrical portion to points spaced along the cylindrical portion,

the end of the cylindrical portion remote from the flange portion being stepped to provide end portions coincident with said portions spaced along the cylindrical portion.

References Cited UNITED STATES PATENTS ROBERT C. RIORDON, Primary Examiner.

D. G. KELLY, Assistant Examiner.

U.S. Cl. X.R. 

